Machine



(ModeL) 2 Sheets-Sheet 1'.

A J HURTU SEWING MACHINE.

PatentedMay 30, 1882.

N. FUERS. Fhnlu-Lillwgn mcf. Wauhinglon. IJv c,

(Model) I 2 Sheets-Sheet 2.

A. J. HURTU. SEWING MACHINE.

No. 258,761. Patefited May 30,1882.

N. Pzrzns Fholo-Lilhognpher. waning. o.c,

STATES PATENT QFFICE.

AUGUSTE JACQUES HURTU, OF PARIS, FRANCE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 258,761, dated May 30,1882.

Application filed August 2 1, 1881. Model) Patented in France September4, 1879, No. 132,585; in Belgium January 29, 1881, No. 53,716, and inEngland February 2, 1381, No. 450.

To all whom it may concern:

Be it known that I, AUGUSTE JACQUES HURTU, engineer, of Paris, France,have invented an Improved Sewing-Machine; and I do hereby declare thatthe following is a full, clear, and exact description of the same,reference being had to the annexed sheets of drawings, making a part ofthe same.

This is an improvement in the class of sewing-machines in whichacircular stationary shuttle and rotary hook are employed, and in whichaccelerated motion is imparted to such hook during part of itsrevolution. I make the shaft carrying the hook in two parts, connectedtogether by gearing so constructed that whilethe part hereinafterdistinguished as the main shaft receives continuous uniform rotarymotion the other, which carries the hook, receives, during part of eachrevolution, a slower or faster motion than the first, as may berequired, in order that the needle-thread shall be thrown rapidly offthe shuttle.

The improvement further relates to the combination and arrangement ofparts, as hereinafter described, whereby the bobbin-case is held inplace and may be released at will; also, whereby the plate to which thedevices for holding the shuttle are attached may be locked in orreleased from a slot in the bedplate of the machine.

In the accompanying drawings, (two sheets,) Figure 1 is a centrallongitudinal vertical section of my machine. Fig. 2 is a plan withbed-plate broken out and some workingparts shown in section. Fig. 3 is atransverse section of same, taken through the cam which operates theneedle-bar. Fig. 4 is a section of the bed-plate, taken on the line 1 2,Fig. 2; and Fig. 5 is a transverse section of the bedplate alone on line3 4, Fig. 2. Figs. 6, 7, and 8 show, respectively, a longitudinalsection, plan, and end view ofthe mechanism whereby a variable motion isimparted to the rotary hook. Figs. 9, 10, and 11 are, respectively, aside view, plan, and end view of the mechanism for regulating the lengthof stitch. Fig. 11 is a perspective view of a part of th'e feedmechanism. Figs. 12 and 13 are sectional views of the shuttle-holdingdevices. Fig. 13 is a plan view of the shuttle-holding devices and theplate (part seen broken away) to which they are attached inverted,together with the notched portion of the bed-plate with which thepivoted catch locks; Fig. 13 is a perspective view of one of the devicesfor holdingthe bobbin-case. Fig. 13 is a cross-section on line5 6, Fig.13. Figs. 15, 16, 17 represent the shuttle, thread-tension device, andbobbin.

Bis the case containing the spool.

D is the main shaft, upon which is mounted the cam for operating theneedle-bar. Theiuner end of the shaft D is made hollow, and through itpasses another shaft, D, carrying at its outer end the rotary hook H, bywhich the thread is passed over the bobbin-case B.

A bevel-pinion, G, is fixed on the other end of shaft D, which gearswith a toothed segment, F, provided with an arm carrying africtionroller, a, Figs. 2, 7, that works in the groove of cam E, bywhich arrangement of parts a variable circular motion is imparted to therotary hook H,as will be hereinafter described. This cam 1*] is formedin two parts,which are adapt, ed for adjustment toward each other, inorder to compensate for wear and prevent backlash, while allowing freemotion of the roller a.

I is the feed'claw, Figs. 4,10,11 ,whosearm is attached to a shaft, K,that is pivoted on. centers between the arms of an auxiliary bar, L,which is similarly pivoted in lugs b, pendent from the bed-plate of themachine. The oscillation of this swinging bar L permits the requiredhorizontal motion of the said feed-claw.

The shaft K is also provided with a lateral arm, M, whose free end, Fig.1, rests upon the circular cam Q, formed on the shaft D. As the latterrotates it is obvious that the feedclaw will be oscillated vertically.The to and-from or horizontal motion of the claw is produced by a cam,J, formed on shaft D contiguous to the aforesaid cam Q. The cam istapered, and acts on a lever, S, which is pivoted to a lug, c, of shaftK, so that it may be adjusted in a horizontal plane for the purpose ofchanging the position of its free end on the cam J for the purpose ofVarying the throw of the feeder I, and thereby making the stitch shorteror longer, as required. The lever S has a pin fixed in its free end, onwhich is pivoted a block, [1, Figs. 10, 11, that bears against the sideof the cam .thread.

J, Figs. 2, 4, 11. held down or in contact with their respective cams,JQ,by means ofthe spiral springY, Fig. 4, which is connected at one endwith the lug c and at the other with a fixed arm, 0, pendent from thebed-plate. Said spring thereby exerts tension in a diagonal direction,so as not only to hold the lever S and arm Min contact with theirrespective cams, J and Q, but also to hold the block (I pressed backagainst the side of the cam J, which position is necessary to therequired operation of the feed I.

For varying the throw of the feed-claw I, I employ the followingmechanism: A spring or elastic bar, N, Figs. 2, 9, 11, ll, is pivoted tothe rear end of lever S, Figs. 1, 9, and at its other end to a segment,0, thatis pivoted centrally in arms or lugs pendent from the bedplate,but which projects through a slot in the latter, Fig. 9, so that aportion of its circular edge is always "isible above the same. A portionof the rear edge of thesegmentO is toothed, and meshes with a worm,P,which is arranged vertically and provided with a milled head, P, Figs.3, 9. By rotating the latter the segment I? is moved around its axis,and the bar N thereby caused to shift the lever S on its fulcrum 0, soas to move the free end of a lever which carries the pivoted block (1toward one end or the other of the tapered cam J, thus varying themotion of the feed-claw I as required-that is to say, if the lever S bemoved toward the larger end of cam J the to-and-fro motion of thefeed-claw I will be greater, and, vice versa, the reverse movement ofthe lever S diminishes the throw of said feed-claw. The up-and-downmotion of the latter is not materially varied, since that is determinedby co-operation of the cam Q and arm M. For determining more preciselythe change in the throw of the lever S an d the consequent variation ofthe stitch, the upper edge of the segment 0 is arranged to work. in aslotted piece,which, like the segment, is provided with numberedgraduations, Fig. 2.

One side of the bobbin-eascB has a circular opening of snflicient sizeto receive the spool or bobbin g, Fig.17. On the other or closed side ofthe bobbin-case is a fixed vertical arm, Fig. 15, which fits in a slotin the clip T, and thus serves to prevent the bobbincase from turning.On this arm is attached a spring, 71-, which serves as a tension devicefor the under The pressure of such spring and the consequent tension onthe thread is regulated by the attaching-screw i.

The thread passes through guide-holes, Fig. 15, in the arm of thebobbin-ease. The lower end of spring h is pointed, and fits in a pocket,k, formed on the side of the bobbin-case. The spring h is therefore heldvertical by the screw 1' and pocket 7;.

The bobbin-case is held between two concave disks or clips, T T, Figs.12 and 13, one of which, T, is movable. The other, T, is rigidlyattached by means of an arm, I, to an ob- The lever S and arm M are longrectangular plate or block,V, whose side edges are beveled to adapt themto fit in corresponding grooves in the sides of a slot in the bed-plate,Fig. 13". For locking such plate in the slot I provide an elbow-shapedcatch, X, which is pivoted to the block at its inner end, so that itsangle projects into a notch, Figs. 2,13, in the edge of the slot in thebedplate. The catch is held thrown out in this position by means of thesame spring, Z,which acts on the arm of clip 'T-that is to say, thespring acts in opposite directions on the catch X and clip-arm m. Bypressing on the projecting end of the catch X, the spring Z iscompressed and the angle of the catch drawn inward, so that the plate,with its attachment, may be removed from the bed-plate.

The inner end of the spring Z bears against the screw n, which isinserted through the arm m of clip T. This arrangement is shown in Figs.1, 2, and 12. Said clip-arm m slides in lateral grooves in the underside of plate, and is provided with a thumb-piece, 0, for use in drawingback the clip T for the purpose of releasing the shuttle.

The screw 1), Figs. 1, 12,serves as an adjustable stop to prevent unduepressure on the shuttle by reason of the action of the spring Z.

When by the rotation of the pulley on the outer end of shaft D thefriction-roller a is carried around in the concentric portion of thegroove of cam E, the two parts D D of the shaft turn together at thesame speed; but immediately the roller a enters thepart of thecam-groove of different radius the segment F will be shil'ted, andacting on the pinion G rotates it in one or the other direction, thusimparting to part D of the shaft, and consequently to the hook H, eithera faster or slower motion than that of part D of said shaft,whichenables the thread to be released and quickly thrown 0d the shuttle.Thus while the part D of the main shaft rotates continuously at the samerate of speed, it transmits through the cam E, segment F, and pinion G',a variable motion to the other part, D-that is to say, the latter has anaccelerated motion in one part of its rotation and a retarded motionduring the remainder.

WVhat I claim is- 1. The combination,with the shaft D D and rotary hookH, of thetoothed segment F, bevelpinion G, and cam E, substantially asand for the purpose set forth.

2. The spring Y, arranged as described, the feed-claw I, the lever S,and arm M, having common pivotal points in the swinging lever L, cams Jand Q, and shaft D, all said parts being combined substantially as andfor the purpose set forth.'

3. The combination, with a shuttle having an arm attached on one side,of the tensionspring. h, entering, at its lower end, a recess, 1', ofsaid shuttle, substantially as described.

at. The combination,with the bed-plate, having a slot one side of whichis notched, as

shown, of the plate V, having a device for jonrnaled block, (I, thelever L, swinging in a holding the shuttle attached, and the pivotalvertical plane, and the tapered cam J, shaft 10 catch X, and spring Zacting thereon, as and D D, and hook H, all as set forth and defor thepurpose specified. scribed, for use in varying the length of stitch. 5.The combination of the elastic bar N, with AUGUSTE JACQUES HURTU.

segment 0, worm P, and knob P, the lever S, Witnesses:

pivoted to adapt it for adjustment in a hori- R0131. M. HOOPER,

zontal plane and carrying at its inner end a JEAN BAPTISTE ROLLAND.

